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Technical Brief

Design and Performance Analysis of Double C-Type Flexure Hinges

[+] Author and Article Information
Lifang Qiu

Professor
School of Mechanical Engineering,
University of Science and Technology Beijing,
30 Xueyuan Road,
Haidian District,
Beijing 100083, China
e-mail: qlf@ustb.edu.cn

Gang Huang

School of Mechanical Engineering,
University of Science and Technology Beijing,
30 Xueyuan Road,
Haidian District,
Beijing 100083, China
e-mail: HGhuangAY@163.com

Siqi Yin

School of Mechanical Engineering,
University of Science and Technology Beijing,
30 Xueyuan Road,
Haidian District,
Beijing 100083, China
e-mail: 15201461409@163.com

1Corresponding author.

Manuscript received July 22, 2016; final manuscript received January 20, 2017; published online May 18, 2017. Assoc. Editor: Hai-Jun Su.

J. Mechanisms Robotics 9(4), 044503 (May 18, 2017) (7 pages) Paper No: JMR-16-1209; doi: 10.1115/1.4036609 History: Received July 22, 2016; Revised January 20, 2017

This paper proposes a series of double C-type flexure hinges for lamina emergent mechanisms (LEMs), designs the structure, and deduces the formula of the equivalent stiffness of the double C-type flexure hinge. Theoretical calculation and finite element simulation analyses of the design examples are used to verify the correctness of the equivalent stiffness calculation formula. In order to improve the bending performance of the flexure hinges, we propose a method to remove some materials of the semicircle of the flexure hinges according to certain rules. Then, the structure of the double C-type flexure hinge is further improved. Finally, the performance of the improved and unimproved double C-type flexure hinges is compared through the finite element simulation analysis, and the results show that the bending performance of the improved double C-type flexure hinge is better than the unimproved double C-type flexure hinge, while the antitensile properties undergo no significant decline.

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References

Figures

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Fig. 1

Three-dimensional model of DC-LET

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Fig. 2

The associated spring model of DC-LET

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Fig. 3

The trends chart of the theoretical and simulation values of the bending angles of DC-LET and HDC-LET under different torques

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Fig. 4

Three-dimensional model of DCR-LET

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Fig. 5

Dimensions of DCR-LET

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Fig. 6

Three-dimensional model of DCC-LET

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Fig. 7

Dimensions of DCC-LET

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Fig. 8

The simulation analysis results of DC-LET

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Fig. 9

The simulation analysis results of HDC-LET

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Fig. 10

The simulation analysis results of DCR-LET

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Fig. 11

The simulation analysis results of DCC-LET

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Fig. 12

Front views of the four flexure hinges

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Fig. 13

The trends chart of the simulation values of the bending angles of the four flexure hinges under different torques

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Fig. 14

The trends chart of the simulation values of the displacements of the four flexure hinges under different forces

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